WO2018050797A1

WO2018050797A1 - Backrest of a vehicle seat having a head restraint

Info

Publication number: WO2018050797A1
Application number: PCT/EP2017/073225
Authority: WO
Inventors: Prashanth P V RADHAKRISHNAN
Original assignee: Adient Luxembourg Holding S.À R.L.
Priority date: 2016-09-15
Filing date: 2017-09-15
Publication date: 2018-03-22

Abstract

The invention relates to a backrest (2) of a vehicle seat (1), comprising a height-adjustable head restraint (3). According to the invention, a height adjustment mechanism of the head restraint (3) is provided, the track of which is a curved track, wherein the head restraint (3) is automatically tilted rearward at the bottom in the event of upward height adjustment of the head restraint (3) and is automatically tilted forward at the bottom in the event of downward height adjustment of the head restraint (3).

Description

Seat back of a vehicle seat with a headrest

description

The invention relates to a seat back of a vehicle seat with a height-adjustable headrest.

Seat backs of a vehicle seat with a height-adjustable headrest are known from the prior art.

Object of the present invention is to provide an improved seat back of a vehicle seat with a height-adjustable headrest.

The object is achieved with a seat back with the features specified in claim 1.

Advantageous embodiments of the invention are the subject of

Dependent claims.

A seat back of a vehicle seat includes a height adjustable headrest. According to the invention, a height adjustment mechanism of the headrest is provided, whose path is a curved path. In this case, the headrest is at a height adjustment of the headrest up

automatically lower side to the rear and with a height adjustment of the headrest downwards the headrest automatically inclines to the front.

The advantage achieved by the invention is, in particular, that a distance between a head of a person sitting on the vehicle seat and the headrest at the correct height adjustment also at People with very different seat size is largely constant. A change of a distance of the headrest to the head by a mechanical displacement of the headrest forward or backward is thus unnecessary. Such a headrest thus always has and person-independent on a perceived as pleasant positioning, at least if the headrest is largely adjusted correctly height. In addition, a risk of injury to a person using the vehicle seat is reduced in an accident.

An embodiment of the invention provides that the headrest on the front side has a concave surface in a vertical course. In such a designed headrest, the distance between the head of the person sitting on the vehicle seat and the headrest at the correct height setting is not only largely constant for people with very different seat size, but the system of correct

height-adjustable headrest is perceived as particularly pleasant for persons with almost any seat size.

Another embodiment of the invention provides that the

Height adjustment mechanism of the headrest has a number of guides, each describing the curved path. Preferably, two opposing guides are provided which describe the same curved path. Such a height adjustment mechanism is mechanically comparatively simple and comparatively inexpensive to produce. In addition, the shape of the guides and thus the shape of the curved paths are easy to fix.

The height adjustment mechanism of the headrest preferably comprises a first transverse strut and a second transverse strut, which are each firmly connected to the headrest. The cross struts are particularly preferably at least partially within the headrest, wherein the ends of the cross struts are vertically displaceable in the number of guides, in particular in two guides, are arranged. Such a height adjustment mechanism is mechanically simple, allows easy height adjustment and high mechanical strength, so that a risk of injury to a person using the vehicle seat is reduced in an accident.

An important embodiment of the invention provides that the headrest comprises a locking mechanism, which has a number of

spring-loaded Arretierungsriegeln includes. This allows a secure locking of the headrest. In particular, a locking of the headrest in any, that is infinitely adjustable in height, position is made possible in a simple manner by clamping.

Preferably, it is provided that a locking element as a first locking element and / or a second locking element are arranged / is, the / each of which is horizontally displaceable from a locking position in a Nichtarretierungsstellung and vice versa / is. This allows a locking of the headrest in any position in a mechanically particularly simple manner by clamping.

In this case, the first locking element particularly preferably has a first toothed rack, which can be driven by means of a first toothed wheel.

Alternatively or additionally, the second locking element on a second rack, which is drivable by means of a second gear. The locking elements are thereby easily brought from the locking position to the non-locking position and vice versa.

Preference is / are the first gear and / or the second gear by means of a respective rack element driven, wherein the Rack elements or the rack element are part of a control element are / is. The control element is part of the headrest and allows height adjustment of the same in a mechanically simple, yet safe way.

In this case, the operating element is particularly preferably manually displaceable and spring-loaded such that in an unattended state the first locking element and / or the second locking element are displaced into the locking position / is. For Federkraftbeaufschlagung a tension spring is provided for example in the headrest, which holds the same in the non-actuated state of the control element so that the locking mechanism, the headrest safely in the

height adjusted.

According to a first alternative of an embodiment, in a free-standing headrest, the guides in the headrest, in particular in their padded area, integrated and lower portions of

Guide rails protrude down from the headrest and are anchored in the seat back.

According to a second alternative of an embodiment, in an integrated headrest, for example in a sports seat, the guides in the seat back, in particular in elevations of the seat back next to the headrest, integrated and the lower portions of guide beams are anchored below the headrest in the seat back.

Embodiments of the invention will be explained in more detail with reference to drawings. Showing: a schematic representation of a seat back according to the invention with a height-adjustable headrest with two alternative persons, a first partial extract of Figure 1, a second partial extract of Figure 1, a schematic side view of the headrest in fixed, lower position, an associated schematic view of the headrest in the lower Position, a schematic side view and an associated view of the headrest in the lower position with dissolved fixation, a schematic side view and an associated view of the headrest in the middle position with dissolved fixation, a schematic side view and an associated view of the headrest in the top position with dissolved fixation, a schematic side view and an associated view of the headrest in the upper position with activated fixation, a schematic side view and an associated view of the headrest in the upper position with dissolved fixation,

10 is a schematic side view and an associated view of the headrest in the lower position with dissolved fixation, 1 1 is a schematic side view and an associated view of the headrest in the lower position with activated fixation,

FIG. 12a is a schematic view of a freestanding headrest;

FIG. 12b shows an associated schematic side view,

FIG. 12c shows an associated perspective view,

13a is a schematic view of an integrated headrest,

Figure 13b is an associated schematic side view and

Figure 13c is an associated perspective view.

Corresponding parts are provided in all figures with the same reference numerals.

FIG. 1 shows a schematic illustration of a vehicle seat 1. The vehicle seat 1 comprises a seat back 2 according to the invention with a height-adjustable headrest 3 with two alternative persons, namely a small person P1 and a large person P2. The headrest 3 is shown in a lower position relative to the height adjustment, in which it is correctly adjusted to the size of the small person P1. The headrest 3 is additionally shown in an upper position with respect to the height adjustment, in which it depends on the size of the large

Person P2 is correctly adjusted. According to the invention, the headrest 3 on the front side has a concave surface 3.1 in a vertical course. According to the invention, a path of a height adjustment mechanism of the headrest 3 is a curved path, wherein at a height adjustment of the headrest 3 upwards the headrest automatically underside backwards and at a height adjustment of the headrest 3 down the headrest 3 is automatically tilted lower side forward.

FIG. 2 shows a first partial extract from FIG. 1. The small person P1 is shown. The headrest 3 is shown in a lower position relative to the height adjustment, in which it is correctly adjusted to the size of the small person P1. A distance A between the head of the small person P1 and the front surface of the headrest 3 is shown here.

FIG. 3 likewise shows a first partial extract from FIG. 1. The big person P2 is shown. The headrest 3 is shown in an upper position relative to the height adjustment in which it is correctly adjusted to the size of the tall person P2. A distance A between the head of the large person P2 and the front surface of the headrest 3 is shown here. Because of the web of the

Höhenverstellmechanismus the headrest 3 is a curved path, wherein at a height adjustment of the headrest 3 upwards, the headrest 3 was automatically tilted lower side back, the distance A for the large person P2 is substantially as large as the distance A shown in Figure 2 for the little person P1.

Figure 4a shows a schematic side view of the headrest 3 in a fixed lower position. A fixed above with the headrest 3 first cross member 4 and an integral with the headrest 3 second cross member 5 have each ends, which in a guide. 6 are arranged guidable. The guide 6 describes a curved path, which allows for a height adjustment of the headrest 3 upwards, the headrest 3 automatically lower side to the rear and at a height adjustment of the headrest 3 down the headrest 3 is automatically tilted lower side forward. In the position shown here so the headrest 3 is shifted with its lower portion to the front.

Figure 4b shows an associated schematic frontal view of

Headrest 3 in lower position. The above firmly connected to the headrest 3 first cross member 4 and the fixedly connected to the headrest 3 second cross member 5 have each ends, which are arranged guidable in the guide 6, not shown. In the headrest 3 are each horizontally and horizontally displaceable a first

Locking element 7 with an upper-side first rack 7.1 and a second locking element 8 with a top-side second

Rack 8.1 arranged. A first gear 9 engages the first

Rack 7.1 and a second gear 10 engages the second

Rack 8.1. A vertically displaceable operating element 1 1 comprises a manually operated handle 1 1 and on each of two sides a vertical rack element 11 1 .2. By means of a tension spring 12, the control element 1 1 is pulled down, causing the

Locking elements 7, 8 are pressed outwards and the

Fix the headrest by clamping, so that a height adjustment is not possible. Only with manual actuation of the control element 1 1, this being moved manually by means of the handle 1 1 .1 within the headrest 3 upwards, the clamping fixation is released and a, also manual, displaceability of the headrest 3 allows for the height adjustment.

FIG. 5 shows a schematic side view and an associated view of the headrest 3 with the first transverse strut 4 and the second transverse strut 5, which are guided in two guides 6, in the lower position with dissolved fixation. In this case, the control element 1 1 manually, so by

Overcome the spring force pushed up, so that the

Locking elements 7, 8 are shifted inwards and thereby no longer fix the headrest by clamping, so that a height adjustment is possible. In the position shown here, the headrest 3 is moved forward with its lower portion.

Figure 6 shows a schematic side view and an associated view of the headrest 3 with the first cross member 4 and second cross member 5, which are guided in two guides 6, in the middle position with dissolved fixation. In this case, the control element 1 1 manually, so by

Overcome the spring force pushed up, so that the

Locking elements 7, 8 are shifted inwards and thereby no longer fix the headrest by clamping, so that a height adjustment is possible. In the position shown here, the headrest 3 is shifted with its lower portion less forward than shown in Figure 5.

Figure 7 shows a schematic side view and an associated view of the headrest 3 with the first cross member 4 and the second cross member 5, which are guided in two guides 6, in the upper position with dissolved fixation. In this case, the control element 1 1 manually, so by

Overcome the spring force pushed up, so that the

Locking elements 7, 8 are shifted inwards and thereby no longer fix the headrest by clamping, so that a height adjustment is possible. In the position shown here, the headrest 3 is shifted with its lower portion to the rear.

Figure 8 shows a schematic side view and an associated view of the headrest 3 with the first cross member 4 and second cross member 5, which are guided in two guides 6, in the upper position with activated Fixation. Here, the control element 1 1 of the spring force is pushed down following, so that the locking elements 7, 8 are displaced outwards and thereby fix the headrest by clamping, so that a height adjustment is not possible. In the upper position shown here, the headrest 3 is shifted with its lower portion to the rear.

Figure 9 shows a schematic side view and an associated view of the headrest 3 with the first transverse strut 4 and second cross strut 5, which are guided in two guides 6, in the upper position with dissolved fixation. In this case, the control element 1 1 manually, so by

Overcome the spring force pushed up, so that the

Locking elements 7, 8 are shifted inwards and thereby no longer fix the headrest by clamping, so that a height adjustment is possible. In the upper position shown here, the headrest 3 is shifted with its lower portion to the rear.

Figure 10 shows a schematic side view and an associated view of the headrest 3 with the first cross member 4 and second

Cross strut 5, which are guided in two guides 6, again in the lower position with dissolved fixation. In this case, the control element 1 1 manually, so pushed by overcoming the spring force upwards, so that the locking elements 7, 8 are shifted inwards and thereby no longer fix the headrest by clamping, so that a height adjustment is possible. In the lower position shown here, the headrest 3 is shifted with its lower portion back to the front.

Figure 11 shows a schematic side view and an associated view of the headrest 3 with the first cross member 4 and second

Cross strut 5, which are guided in two guides 6, in the lower position with activated fixation. In this case, the operating element 1 1 of the spring force pushed down following, so that the locking elements 7, 8 are displaced outwards and thereby fix the headrest by clamping, so that a height adjustment is not possible. In the lower position shown here, the headrest 3 is shifted with its lower portion back to the front.

Figures 12a, 12b and 12c show a schematic view, an associated schematic side view and an associated

Perspective view of a freestanding headrest 3 with a surface formed from a reference 3.1. The guides 6 are integrated in the headrest 3 in the padded area and lower portions of guide beams 6.1 protrude down from the headrest 3 and are in a support structure 2.1 of the seat back 2 means

Fixing sleeves anchored 2.2. Side next to the integrated

Guides 6, the headrest 3 foam body 3.2. Between an upper side of the seat back 2 and an underside of the headrest 3, the lower portions of the guide support 6.1 can be seen.

Figures 13a, 13b and 13c show a schematic view, an associated schematic side view and an associated

Perspective view of an integrated headrest in a sports seat. The headrest 3 has a surface 3.1 formed from a cover. The guides 6 are integrated in the seat back 2 in their trained as elevations 2.3 sections. The headrest 3 is thus arranged between the elevations 2.3. Also the lower sections of the

Guide support 6.1 are integrated in the seat back 2 and in the

Supporting structure 2.1 of the seat back 2 anchored by means of fastening sleeves 2.2. The guide carriers 6.1 are not visually recognizable. LIST OF REFERENCE NUMBERS

1 vehicle seat

2 seat back

2.1 support structure

2.2 mounting sleeve

2.3 Survey

3 headrest

3.1 surface

3.2 foam body

4 first cross strut

5 second crossbar

6 leadership

6.1 Leaders

7 first locking element

7.1 first rack

8 second locking element

8.1 second rack

9 first gear

10 second gear

1 1 control element

1 1 .1 handle

1 1 .2 rack element

12 tension spring

A distance

P1 small person

P2 big person

Claims

claims

1 . Seat back (2) of a vehicle seat (1), comprising a

height-adjustable headrest (3),

characterized by a height adjustment mechanism of

Headrest (3) whose track is a curved path, wherein at a height adjustment of the headrest (3) upwards, the headrest (3) automatically on the underside backwards and with a height adjustment of the headrest (3) down the headrest (3) automatically below tilted forward.

2. seat back (2) according to claim 1,

characterized in that the headrest (3) on the front side has a concave surface 3.1 in a vertical course.

3. seat back (2) according to claim 1 or 2,

characterized in that the height adjustment mechanism of the headrest (3) comprises a number of guides (6), each describing the curved path.

4. seat back (2) according to claim 3,

characterized in that the height adjustment mechanism of the headrest (3) comprises a first transverse strut (4) and a second transverse strut (5) which are each firmly connected to the headrest (3).

5. seat back (2) according to claim 4,

characterized in that the transverse struts (4,5) at least partially extend within the headrest (3) and that ends of the transverse struts (4,5) höhenverschieblich in the number of

Guides (6) are arranged.

6. Seat back (2) according to one of the preceding claims,

characterized in that the headrest (3) has a

An arresting mechanism comprising a number of spring-loaded locking bolts.

7. seat back (2) according to claim 6,

characterized in that as Arretierungsriegel a first

Locking element (7) and / or a second

Locking element (8) are arranged / which are each / is horizontally displaceable from a locking position to a non-locking position and vice versa.

8. seat back (2) according to claim 7,

characterized in that the first locking element (7) comprises a first rack (7.1) which is drivable by means of a first gear (9) and / or that the second locking element (8) has a second rack (8.1) which by means of a second

Gear (10) is drivable.

9. seat back (2) according to claim 8,

characterized in that the first gear (9) and / or the second gear (10) by means of a rack member (1 1 .2) are driven / is, wherein the rack members (1 1 .2) and the rack member (1 1. 2) part of an operating element (1 1) are / is.

10. seat back (2) according to claim 9,

characterized in that the operating element (1 1) is manually displaceable and is spring-loaded so that in an unattended state, the first locking element (7) and / or the second locking element (8) are displaced into the locking position / is.